WO2013170839A1

WO2013170839A1 - Link aggregation method and device for traffic distribution

Info

Publication number: WO2013170839A1
Application number: PCT/CN2013/080343
Authority: WO
Inventors: 王琳琳; 马玉霞; 冯景斌
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-09-29
Filing date: 2013-07-29
Publication date: 2013-11-21
Also published as: EP2903226A1; CN103716252A; EP2903226A4

Abstract

Disclosed is a link aggregation method for traffic distribution. The method comprises: when traffic is distributed according to a link quality factor of a member link in a link aggregation group, first selecting a member link with a high link quality factor to transmit a service; and after the traffic of the link with the high link quality factor reaches an upper limit, selecting a link with another link quality factor to transmit the service. The present invention further discloses a link aggregation device for traffic distribution, wherein the device is a link node and used for: when traffic is distributed according to a link quality factor of a member link in a link aggregation group, first selecting a member link with a high link quality factor to transmit a service; and after the traffic of the link with the high link quality factor reaches an upper limit, selecting a link with another link quality factor to transmit the service. By adopting the present invention, the service quality of the service transmission can be improved.

Description

Link aggregation method and device for distributing traffic

The present invention relates to the field of data technologies, and in particular, to a link aggregation method and device for distributing traffic. Background technique

In the field of Packet Transmission Network, Link Aggregation Control Protocol (LACP), Multilink Point-to-Point Protocol (ML-PPP, Multilink-PPP), Link Capacity Adjustment Mechanism (LCAS, Link Capacity) Techniques such as Adjustment Scheme and composite links are commonly used link aggregation technologies.

The LACP link aggregation defines a technology for aggregating multiple Ethernet links together; the ML-PPP can support multiple types of links to be aggregated together; the LCAS is used to synchronize a digital system (SDH) , Synchronous Digital Hierarchy ) virtual containers (VC, Virtual Container) are aggregated to form a wider logical link. When all of the existing technologies are used for link aggregation, the two methods are generally used. The load balancing mode is as follows: The member links of the aggregation group are in an equal relationship, and the traffic is divided on each member link. The other is the active/standby mode, which is: The aggregation group contains two member links, one is the primary link and the other is the standby link. The two links are mutually protected.

In summary, in the prior art, for a plurality of member links of an aggregation group, the load sharing mode is a method for distributing traffic that distributes traffic evenly on multiple member links, regardless of link quality; The active/standby mode does not consider the link quality. As long as the current link is available, the active/standby switchover is performed if the current link is unavailable. Summary of the invention

In view of this, the main purpose of the embodiments of the present invention is to provide a link aggregation method and device for distributing traffic, which improves the service quality of service transmission.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

A link aggregation method for distributing traffic, the method includes: when distributing traffic according to a link quality factor of a member link in a link aggregation group, first selecting a member link transmission service with a high link quality factor, in the chain After the link traffic with a high path quality factor reaches the upper limit, the link transmission service of other link quality factors is selected.

The method further includes: before the distributing the traffic according to the link quality factor of the member links in the link aggregation group, the method further includes:

The link aggregation group is created, and the member link included in the link aggregation group is specified, and the link quality factor is configured as a static configuration mode or a dynamic configuration mode.

When the static configuration mode is adopted, the method further includes: the link node receiving the value of the configured link quality factor by using an external command.

The method further includes: the link node selecting the member link to transmit the service according to the value of the link quality factor according to the highest to lowest order.

When the dynamic configuration mode is adopted, the method further includes: the link node receiving the configured performance index of the member link by using an external command.

The method further includes: after the link node calculates the value of the link quality factor according to the performance indicator, selecting the member link to transmit the service according to the value of the link quality factor according to the highest to lowest ;

The performance indicator specifically includes at least one of a link type, a link rate, a link delay, a jitter, a packet loss rate, and a link usage rate.

The method further includes: configuring the service to be a transmission mode selected by the directional link. The transmission mode in which the service is configured as a directional link selection includes: configuring a service The correspondence between the priority and the link quality factor configures the high-priority service to be transmitted through the member link with a high link quality factor.

The method further includes: the link node selecting, according to the correspondence between the service priority and the link quality factor, a member link corresponding to the service priority to forward the corresponding service.

A link aggregation device that distributes traffic. The device is a link node. When the traffic is distributed according to the link quality factor of the member links in the link aggregation group, the member link transmission service with a high link quality factor is selected first. After the link traffic with the high link quality factor reaches the upper limit, the link transmission service of the other link quality factor is selected.

The device is further configured to receive the value of the configured link quality factor by using an external command.

The device is further configured to select the member link to transmit the service according to the value of the link quality factor according to the highest to lowest order.

The device is further configured to receive the configured performance indicator of the member link by using an external command.

The device is further configured to: after calculating the value of the link quality factor according to the performance indicator, select the member link to transmit the service according to the value of the link quality factor in descending order;

In the embodiment of the present invention, when the traffic is distributed according to the link quality factor of the member link in the link aggregation group, the member link transmission service with a high link quality factor is selected first, and after the link traffic with a high link quality factor reaches the upper limit, Then select the link transmission service of other link quality factors.

According to the embodiment of the present invention, since the traffic is distributed according to the link quality factor, and the member link with the high link quality factor is preferentially forwarded, the member link with high link quality factor is fully utilized, thereby improving service transmission. service quality. DRAWINGS

1 is a schematic flowchart of implementing a method according to an embodiment of the present invention;

2 is a schematic diagram of creating a link aggregation group according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a scheduling manner for distributing traffic according to a member link quality factor according to an embodiment of the present invention. detailed description

In the embodiment of the present invention, when the traffic is distributed according to the link quality factor of the member link in the link aggregation group, the member link transmission service with the high link quality factor is selected first, and the link traffic with the high link quality factor is reached. After the upper limit, the link transmission service of other link quality factors is selected.

A link aggregation method for distributing traffic mainly includes the following contents:

1. Create a link aggregation group through the NMS, specify the aggregation technology and related configuration parameters used by the link aggregation group, and indicate the member links that the link aggregation group needs to include. The link aggregation group to be created and the related configuration parameters are sent to the device through external commands. Here, the external command includes a method of delivering the information through the interface between the network management device and the device, and the manner of issuing the command line. The device refers to all link nodes in the network, which are not described below.

Here, the aggregation technology can adopt LACP, ML-PPP, composite link technology, and the like. According to the polymerization technology used.

Here, the member link may be selected as an Optical Transport Network (OTN) type link, an SDH type link, an Ethernet type link, and other physical links than the OTN, SDH, and Ethernet types. You can also choose a logical type link, and so on. The SDH type link may be an E1 interface (an E1 interface is a 2.048M link, encoded by PCM), a synchronous transport module level n (STM-N, Synchronous Transport Module level n), an ATM-STM-N, or the like; Ethernet type links can be FE links (FE links are Fast Ethernet links), GE links (GE links are Gigabit Ethernet links); Other physical links can be Digital Subscriber Lines (XDSL) , microwave; logical type link can be: ML-PPP, general routing encapsulation (GRE, Generic Routing Encapsulation) Tunnel, Label Switching Path (LSP), Virtual Office Area, or Virtual Local Area Network (VLAN) interface.

2. Configure the link aggregation group to forward traffic according to the link quality factor of the member link. If yes, you can further select the link quality factor calculation method. You can choose to automatically calculate the link quality factor. You can choose to manually configure the value of the link quality factor.

(1) The link quality factor is an indicator used to evaluate the quality of the link. Depending on the type of service and the needs of the user, the factors determining the link quality factor may be: link type, link rate, and link time. Performance indicators such as delay, jitter, packet loss rate, and link usage.

(2) The link quality factor is in the range of 1-N. N indicates that the link quality is the best. You need to select this link first. 1 indicates that the link quality is the worst. Try to avoid this link. The link quality factors of different links can be the same. The link with the same link quality factor randomly selects one transmission when forwarding the service.

(3) When the NMS chooses to manually configure the link quality factor, it is the value of the link quality factor of each link in the static configuration group and the device is delivered.

(4) When the NMS chooses to automatically configure the link quality factor, you need to input various indicators (link type, link rate, link delay, jitter, packet loss rate, link usage rate) that affect the link quality factor. The proportion. The proportion of each indicator varies from 0 to 100%, and the sum of the weights of the various indicators is 100%. After the weight of the link quality factor indicator is delivered to the device, the device needs to automatically calculate a base value for each indicator of each link. The value calculated by multiplying the weight of each indicator by the number of links is normalized to obtain a link quality factor value of 1-N. The link quality factor value indicates the best link quality, and the lowest value indicates the worst link quality. Since the indicators of the link are dynamically changed, the link quality factor recalculation needs to be triggered when the indicator changes. Thereby the value of the link quality factor is kept in sync with the real-time status of the link.

(5) When the NMS chooses to forward traffic according to the link quality factor, and the device is configured according to static After the dynamic algorithm obtains the value of the link quality factor, the device preferentially forwards the link with a high link quality factor when forwarding the service based on the link aggregation group, and selects the link after the link with the high link quality factor is full. The quality factor is followed by link forwarding. This ensures that high-quality links are fully utilized while avoiding the use of low-quality links to transport services. This type of service forwarding is completely different from the existing load sharing method. There is a big advantage in the scenario where the link quality difference is large and the traffic is not full.

Specifically, comparing the embodiments of the present invention with the prior art, the beneficial effects of the member link priority forwarding service of the embodiment of the present invention and the member link priority forwarding service with high link quality factor are described as follows:

The load balancing mode of the prior art is the distribution mode of the average traffic distribution. The link quality is not considered. However, there are actually differences between the multiple member links of the aggregation group. For example, the quality of some member links is very good. Some member links are available, but the link delay or link quality is not very good. Because the existing technology cannot distinguish the links according to the link quality, the high-quality link forwarding service cannot be optimized, but the services are evenly distributed. On all links, even if the use of high-quality links is not sufficient, the traffic needs to be equally divided into low-quality links. Therefore, the load sharing does not match the actual link quality.

Compared with the prior art, the link quality factor of the member link can be obtained by using the embodiment of the present invention, and the link priority forwarding service with a high link quality factor is preferentially selected. After the link traffic with a high link quality factor is full, Traffic is then distributed to other quality links. With the embodiment of the present invention, the load sharing is matched with the actual link quality, and the link with high link quality factor can be ensured to be fully used.

3. Combine the service priority with the link quality factor of the link to ensure the transmission quality of the high priority service.

Because the existing technology is used, when the services of different priorities are forwarded, the link is randomly selected. It is possible that the high-priority service selects a link with poor link quality, and thus The quality of service for high priority services is truly guaranteed. In the embodiment of the present invention, the service priority is combined with the link quality factor of the link, so that the high-priority service preferentially forwards the service by selecting a link with a high link quality factor, and the low-priority service passes the corresponding Selecting a link with a low link quality factor preferentially forwards the service, thereby helping to provide a directional link selection transmission method for high priority services.

Further, when the high-priority service and the low-priority service are transmitted through the same link aggregation group, if the service is divided into traffic on each link of the link aggregation group according to the prior art, the traffic is implemented according to the present invention. After the link quality factor is introduced, all services select high-quality link transmissions at the same time, so low-priority services also have a certain impact on high-priority services. In order to solve this problem, an embodiment of the present invention provides a solution that combines a service priority and a link quality factor. You can combine the priority of a service with the quality factor of a member link to improve the link stability of an aggregation group and to provide better quality of service for high-priority services. The following is specifically explained.

(1) For the link aggregation group, the NMS configures which link of the link quality factor is forwarded for each priority service. If it is not configured, it indicates that any link in the aggregation group can be selected. This configuration delivers the device through the NMS.

(2) According to the existing Quality of Service (QOS) mode, the device allocates a number of queues for each link aggregation group to store service packets of different priority services.

(3) The device forwards and forwards service packets in each queue of the link aggregation group. If the service priority and the link quality factor are not associated, the forwarding is scheduled in the normal manner. If the service priority and the link quality factor association are configured, the device forwards the service packet according to the service priority and the member link corresponding to the service priority. For example, the service with the highest priority selects the link forwarding with the link quality factor of N, and the other priority services select the link for the link quality factor 1~(N-1). In this way, high priority services and low levels can be guaranteed. Priority-based services are isolated at the forwarding level to reduce the impact of low-priority services on high-priority services.

In summary, the embodiments of the present invention identify different performance indicators (link type, link rate, link delay, jitter, packet loss rate, link usage rate) of link members in the link aggregation group. The link quality factor of the link is calculated, and the link quality factor is introduced to ensure that the high-quality link in the link aggregation group is fully utilized, thereby improving the service quality of the link aggregation group. Further, by combining the service priority and the link quality factor, the quality of service guarantee for the high priority service is improved.

Here, the device is further configured to receive the value of the configured link quality factor by an external command.

Here, the device is further configured to select the member link to transmit the service in descending order according to the value of the link quality factor.

Here, the device is further configured to receive the configured performance indicator of the member link by using an external command.

Here, the device is further configured to: after calculating the value of the link quality factor according to the performance indicator, select the member link to transmit the service according to the value of the link quality factor according to the highest to lowest;

The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings.

Embodiment: How to distribute traffic according to the link quality factor. FIG. 1 is a schematic flowchart of an implementation process of a link aggregation method for distributing traffic according to a link quality factor according to an embodiment of the present invention, where the method includes the following steps:

Step 101: Create a link aggregation group.

Step 102: Configure a method for calculating a link quality factor of a member link in the link aggregation group. Step 103: Configure an association between a link quality factor and a service priority.

Step 104: All configuration information configured in steps 101 to 103 is delivered to the device.

Step 105: The device calculates a value of a link quality factor of each member link.

Step 106: The device forwards the service according to the configuration information.

Here, when the link quality factor is not used, the existing link aggregation technology is adopted. Example: How to create a link aggregation group.

Figure 2 is a schematic diagram of creating a link aggregation group. The aggregation mode of the composite link is a virtual link bonding group. For device 1, create composite link 1, which includes 1 GE link, one ML-PPP link, and one SHDSL link. For device 2, create composite link 2, including one GE link, one ML-PPP. Link, an FE link.

Here, the link quality factor of the member links in the composite link is manually configured, and the link quality factors of the devices at both ends are symmetrically configured. For composite link 1 of device 1, the link quality factor of the GE link is set to 3, the link quality factor of the ML-PPP link is 2, and the link quality factor of the SHDSL link is 1. For the composite link 2 of device 2, the link quality factor of the GE link is set to 3, the link quality factor of the ML-PPP link is 2, and the link quality factor of the FE link is 1. A link quality factor of 3 indicates that the link quality is the best, and a value of 1 indicates that the link quality is the worst.

Here, FIG. 3 is a schematic diagram of a scheduling manner for distinguishing link member link quality factor distribution traffic. For the composite link, eight priority queues are used, and the eight queues correspond to CS7, CS6, EF, AF1, AF2, AF3, AF4, and BE. You can configure the association between the service priority and the link quality factor of the link aggregation group through the NMS. That is: Specify CS7, CS6, and EF to use the link with the link quality factor of 3. Specify AF1, AF2, AF3, and AF4. A link with a link quality factor of 2; indicates that the BE service uses a link with a link quality factor of 1.

According to the configuration of the link quality factor of the user in FIG. 2, in combination with the scheduling mode configuration of FIG. 3, when the service of the device 1 is forwarded, the high-priority services CS7, CS6, and EF select the GE link with the best link quality. Forwarding, AF1, AF2, AF3, and AF4 select M-PPP link forwarding with medium link quality. For best-effort BE services, choose SHDSL link forwarding with poor stability.

It can be seen that: This example uses a composite link to implement link aggregation. The link quality factor of member links is statically configured according to the type of the link. By allowing different priority services to use different quality links, a true top-down is provided. Quality of service guarantee.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Industrial applicability

In the embodiment of the present invention, when the traffic is distributed according to the link quality factor of the member link in the link aggregation group, the member link transmission service with a high link quality factor is selected first, and after the link traffic with a high link quality factor reaches the upper limit, Then select the link transmission service of other link quality factors. According to the embodiment of the present invention, since the traffic is distributed according to the link quality factor, and the member link with the high link quality factor is preferentially forwarded, the member link with high link quality factor is fully utilized, thereby improving service transmission. service quality.

Claims

claims

1. A link aggregation method for distributing traffic. The method includes: when distributing traffic according to the link quality factors of member links in the link aggregation group, first select the member link with a high link quality factor to transmit the service. After the traffic of the link with the high link quality factor reaches the upper limit, the link with other link quality factors will be selected to transmit the service.

2. The method according to claim 1, wherein before distributing traffic according to the link quality factors of member links in the link aggregation group, the method further includes:

Create the link aggregation group, specify the member links included in the link aggregation group, and configure the link quality factor in a static configuration mode or a dynamic configuration mode.

3. The method according to claim 2, wherein when the static configuration mode is adopted, the method further includes: the link node receives the configured link quality factor value through an external command.

4. The method according to claim 3, wherein the method further includes: the link node selects member links in order from high to low to transmit the service according to the value of the link quality factor.

5. The method according to claim 2, wherein when the dynamic configuration mode is adopted, the method further includes: the link node receives the configured performance index of the member link through an external command.

6. The method according to claim 5, wherein the method further comprises: after the link node calculates the value of the link quality factor according to the performance index, according to the value of the link quality factor in order from high to The lower order member link is selected to transmit the service;

The performance indicators specifically include at least one indicator among link type, link rate, link delay, jitter, packet loss rate, and link usage rate.

7. The method according to any one of claims 2 to 6, wherein the method further includes: configuring the service to be a transmission mode selected by a directional link.

8. The method according to claim 7, wherein the service is configured as directional link selection The specific transmission methods include: configuring the corresponding relationship between service priorities and link quality factors, and configuring high-priority services to be directed to be transmitted through member links with high link quality factors.

9. The method according to claim 8, wherein the method further includes: the link node selects the member link corresponding to the service priority for forwarding according to the corresponding relationship between the service priority and the link quality factor. corresponding business.

10. A link aggregation device that distributes traffic. The device is a link node and is configured to distribute traffic based on the link quality factors of the member links in the link aggregation group. First, select the member link with the higher link quality factor. For transmission services, after the traffic of the link with high link quality factor reaches the upper limit, the transmission service of the link with other link quality factors is then selected.

11. The device according to claim 10, wherein the device is further configured to receive the configured link quality factor value through an external command.

12. The device according to claim 11, wherein the device is further configured to select member links to transmit the service in order from high to low according to the value of the link quality factor.

13. The device according to claim 10, wherein the device is further configured to receive the configured performance index of the member link through an external command.

14. The device according to claim 13, wherein the device is further configured to, after calculating the value of the link quality factor according to the performance index, in order from high to low according to the value of the link quality factor. Select member links to transmit the services;